@misc{indiciaeebbd0109d328,
  title = {Semiclassical matrix elements from periodic orbits},
  author = {Eckhardt, B. and Fishman, S. and Mueller, K. and Wintgen, D.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19920046936},
  note = {Source identifier: 19920046936}
}